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Search Results: 1 - 10 of 397675 matches for " C.B.; Freitas da Silva "
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Enfermero-docente: aspectos interrelacionados con su formación
Macedo-Costa,K.N de F.; De Almeida Rebou?as,C.B.; Freitas da Silva,G.R.; Markert,W.;
Enfermería Global , 2010, DOI: 10.4321/S1695-61412010000200017
Abstract: este texto trata de algunas reflexiones que juzgamos importantes y que están juntos para la formación cultural del profesor. son presentados los conceptos de semicultura y teoría inmanente de adorno, así como crítica reflexiva a la industria cultural. también es expuesto el concepto de modernidad de habermas. focalizamos la formación del persona y los tabúes asociados al magisterio. al final, con el auxilio de las lecturas de esos pensadores, sugerimos algunas cuestiones orientadas a la formación profesional del enfermero docente.
A new species of Neotropical freshwater stingray of the genus Potamotrygon Garman, 1877 from the Río Madrede Díos, Peru (Chondrichthyes: Potamotrygonidae)
Silva, Jo?o Paulo C.B. da;Carvalho, Marcelo R. de;
Papéis Avulsos de Zoologia (S?o Paulo) , 2011, DOI: 10.1590/S0031-10492011000800001
Abstract: potamotrygon tatianae sp. nov., is described from río madre de díos, peru, upper rio madeira basin. the new species is distinguished from all congeners by a unique combination of characters, including its dorsal color pattern formed by a relatively slender, highly convoluted, beige to dark brown vermicular pattern, a single row of dorsal tail spines, and a relatively longer tail posterior to caudal stings. potamotrygon tatianae sp. nov., occurs sympatrically with other species of potamotrygon (p. falkneri, p. orbignyi and p. motoro). from the similar species p. falkneri, p. tatianae sp. nov., is further distinguished by the absence of circular, reniform, and oval spots, by its proportionally much longer tail, by having dorsal tail spines in one irregular row, and by features of the ventral lateral-line canal, dermal denticles and neurocranium. from p. orbignyi, the new species is distinct by lacking a reticulate pattern on dorsal disc and by the presence of two angular cartilages. from p. motoro, p. tatianae sp. nov., is further separated by the lack of ocelli formed by strong black concentric rings, by the more flattened aspect of its head and disc, and by having smaller and more numerous teeth. the discovery of a new species that so closely resembles a congeneric form in color pattern, a feature highly variable within the latter, highlights the importance of examining large series of individuals and of detailed morphological analyses in revealing the potentially highly cryptic nature of the diversity within the family.
The Generation of Nonlinear Internal Waves
Christopher R. Jackson,José C.B. da Silva,Gus Jeans
Oceanography , 2012,
Abstract: Nonlinear internal waves are found in many parts of the world ocean. Their widespread distribution is a result of their origin in the barotropic tide and in the variety of ways they can be generated, including by lee waves, tidal beams, resonance, plumes, and the transformation of the internal tide. The differing generation mechanisms and diversity of generation locations and conditions all combine to produce waves that range in scale from a few tens of meters to kilometers, but with all properly described by solitary wave theory. The ability of oceanic nonlinear internal waves to persist for days after generation and the key role internal waves play in connecting large-scale tides to smaller-scale turbulence make them important for understanding the ocean environment.
Benzotriazole and tolytriazole as corrosion inhibitors of carbon steel 1008 in sulfuric acid
Douglas K. da Silva,Gisele C.B. Ribas,Maico T. da Cunha,Silvia M.L. Agostinho
Portugaliae Electrochimica Acta , 2006,
Abstract: In this work the characteristics of corrosion and inhibition of 1008 stainless steel in 0.5 mol.L-1 H2SO4 were investigated by physical and electrochemical methods. Organic compounds containing the heteroatom of N as benzotriazole (BTAH), tolytriazole (TTAH) and mixtures of BTAH + TTAH were used as corrosion inhibitors. The techniques used were: open circuit potential, anodic potentiodynamic polarization measurements, chronoamperometry, electrochemical impedance spectroscopy, weight loss and optical microscopy. The anodic polarization showed that the increase of both concentrations BTAH or TTAH diminishes the current density in all the potential anodic range studied; these results together with the weight loss measurements suggest that the inhibitors act by blocking the surface and that the interaction among them is only of destructive nature when inhibiting efficiency is approximated 100%, revealing that at low concentration both inhibitors act without affecting the mechanisms of the cathodic processes, but the anodic polarization curves in presence of the TTAH showed a strong inhibitive effect in all the potential range studied. However, both gravimetric and electrochemical results suggest a synergic effect for the inhibitive efficiency of the mixture 1.10-3 mol.L-1 BTAH + 1.10-3 mol.L-1 TTAH.
Internal Solitary Waves in the Red Sea: An Unfolding Mystery
José C.B. da Silva,Jorge M. Magalh?es,Theo Gerkema,Leo R.M. Maas
Oceanography , 2012,
Abstract: The off-shelf region between 16.0° and 16.5°N in the southern Red Sea is identified as a new hotspot for the occurrence of oceanic internal solitary waves. Satellite observations reveal trains of solitons that, surprisingly, appear to propagate from the center of the Red Sea, where it is deepest, toward the continental shelf, but they do not survive as coherent structures over the shelf. These solitons are characterized by coherent crest lengths exceeding 80 km and crest-to-crest distances of more than 2 km, compatible with signatures of large-amplitude solitary waves. Despite the fact that these Red Sea solitons have large amplitudes, they appear to be generated by very weak surface tides. Tidal current velocity is only about 5 cm s–1 over the shelf, much weaker than over other ocean shelves where similar solitary waves have been reported. The appearance of these waves over this particular geographical stretch suggests generation by a locally amplified internal tide on the main pycnocline. We consider three possible explanations for soliton generation in the Red Sea: interfacial tide resonance, local generation by internal tidal beams generated at the shelf breaks, and local generation by internal tidal beams generated at the shelf breaks but first amplified by repeated focusing reflections.
Benzotriazole and tolytriazole as corrosion inhibitors of carbon steel 1008 in sulfuric acid
Silva,Douglas K. da; Ribas,Gisele C.B.; Cunha,Maico T. da; Agostinho,Silvia M.L.; Rodrigues,Paulo R.P.;
Portugaliae Electrochimica Acta , 2006,
Abstract: in this work the characteristics of corrosion and inhibition of 1008 stainless steel in 0.5 mol.l-1 h2so4 were investigated by physical and electrochemical methods. organic compounds containing the heteroatom of n as benzotriazole (btah), tolytriazole (ttah) and mixtures of btah + ttah were used as corrosion inhibitors. the techniques used were: open circuit potential, anodic potentiodynamic polarization measurements, chronoamperometry, electrochemical impedance spectroscopy, weight loss and optical microscopy. the anodic polarization showed that the increase of both concentrations btah or ttah diminishes the current density in all the potential anodic range studied; these results together with the weight loss measurements suggest that the inhibitors act by blocking the surface and that the interaction among them is only of destructive nature when inhibiting efficiency is approximated 100%, revealing that at low concentration both inhibitors act without affecting the mechanisms of the cathodic processes, but the anodic polarization curves in presence of the ttah showed a strong inhibitive effect in all the potential range studied. however, both gravimetric and electrochemical results suggest a synergic effect for the inhibitive efficiency of the mixture 1.10-3 mol.l-1 btah + 1.10-3 mol.l-1 ttah.
Evaluation of the Antiproliferative Effect of Infusions and Essential Oil of Aloysia gratissima
C.A.L. Hister,H.D. Laughinghouse,C.B. Da Silva,T.S. Do Canto Dorow
Pakistan Journal of Biological Sciences , 2009,
Abstract: Aloysia gratissima is used in Brazilian folk medicine for the treatment of digestive and respiratory diseases. The infusions (6 and 24 g L-1) and essential oils (0.25%, on ethanol) were prepared and we used groups of five Allium cepa bulbs for each treatment. A total of 2500 cells per treatment were analyzed and the mitotic indexes were calculated. The antiproliferative effect of infusions and essential oils of Aloysia gratissima on the Allium cepa (onion) cell cycle was evaluated using the leaves of studied specimens. The infusions presented a significant decrease in the mitotic index (4.55% at 6 g L-1 and 2.04% at 24 g L-1) compared to the control-water (6.83%), as well as for the essential oil (2.58%), in comparison to the control-ethanol (3.65%). This investigation showed that the infusions and essential oil of Aloysia gratissima present important antiproliferative effects on the Allium cepa cell cycle.
Associa??o entre índice de ventila??o e tempo de ventila??o mecanica em lactentes com bronquiolite viral aguda
Almeida-Júnior, Armando A.;Silva, Marcos T. N. da;Almeida, Celize C.B.;Jácomo, Andréa D. N.;Nery, Breno M.;Ribeiro, José D.;
Jornal de Pediatria , 2005, DOI: 10.1590/S0021-75572005000800010
Abstract: objective: to evaluate the association between time on mechanical ventilation and anthropometric, clinical and pulmonary function variables, measured early, in infants on invasive mechanical ventilation with acute respiratory failure due to viral bronchiolitis, and the temporal progression of variables with significant correlations. methods: twenty-nine infants admitted to the pediatric intensive care unit of unicamp university hospital were studied. acute viral bronchiolitis was defined according to clinical and radiological criteria. children with chronic diseases and those that were hemodynamically unstable were excluded. all measurements were taken after 24 to 72 hours' mechanical ventilation, using volumetric capnography and blood gas analysis. mechanical ventilation time was divided into: < 7 days and > 7 days. association between time on mechanical ventilation and the variables analyzed was determined by spearman's correlation coefficient (rs). results: time on mechanical ventilation showed a significant positive correlation with paco2 (rs = 0.45, p = 0.01) and ventilation index (rs = 0.51, p = 0.005), and a negative correlation with ph (rs = -0.40, p = 0.03). ventilation indices of 37, measured between day one and day five, was associated with a progressively increased risk of more than 7 days on mechanical ventilation (or = 4.2 on the first day to 15.71 on the fourth day). conclusion: ventilation index, paco2 and ph, measured early, were associated with prolonged mechanical ventilation, reflecting the severity of ventilatory disturbance and the need for support.
Comparative Electrochemical Behaviour of the Complexes trans-[Mo(NCN){NCNC(O)R}(dppe)2]Cl (R = Et or Ph) and trans-[Mo(NCN)CI(dppe)2][BF4]
Alegria,Elisabete C.B.A.; Cunha,Sónia M.P.R.M.; Martins,Luísa M.D.R.S.; Silva,M. Fátima C. Guedes da; Pombeiro,Armando J.L.;
Portugaliae Electrochimica Acta , 2004,
Abstract: the bis(cyanoimide) complex trans-[mo(ncn)2(dppe)2] (dppe = ph2pch2ch2pph2) is susceptible of electrophilic attack to form the acylated and aroylated derivatives trans-[mo(ncn){ncnc(o)r}(dppe)2]cl (r = et 2a or ph 2b). herein, we report a preliminary study on the electrochemical behaviour of complexes 2 and the derivative trans-[mo(ncn)cl(dppe)2][bf4] 3, as investigated by cyclic voltammetry (cv) and controlled-potential electrolysis (cpe), what has allowed a comparison of the electron-donor ability of the ligands.
Comparative Electrochemical Behaviour of the Complexes trans-[Mo(NCN){NCNC(O)R}(dppe)2]Cl (R = Et or Ph) and trans-[Mo(NCN)CI(dppe)2][BF4]
Elisabete C.B.A. Alegria,Sónia M.P.R.M. Cunha,Luísa M.D.R.S. Martins,M. Fátima C. Guedes da Silva
Portugaliae Electrochimica Acta , 2004,
Abstract: The bis(cyanoimide) complex trans-[Mo(NCN)2(dppe)2] (dppe = Ph2PCH2CH2PPh2) is susceptible of electrophilic attack to form the acylated and aroylated derivatives trans-[MO(NCN){NCNC(O)R}(dppe)2]Cl (R = Et 2a or Ph 2b). Herein, we report a preliminary study on the electrochemical behaviour of complexes 2 and the derivative trans-[Mo(NCN)Cl(dppe)2][BF4] 3, as investigated by cyclic voltammetry (CV) and controlled-potential electrolysis (CPE), what has allowed a comparison of the electron-donor ability of the ligands.
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